I have had this work many times before, and I cannot understand why it doesn't work this time.
It is the same computer as discussed in this thread, the Dell Optiplex 780 with SSD + HDD, now I have activated the third storage device.
This happens when trying to mount
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sprinterdriver@OptiPlex-780:~$ sudo mount -a
[sudo] password for sprinterdriver:
mount: /terralager: mount(2) system call failed: No such file or directory.Code: Select all
sudo lsblk --fs
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
sda
├─sda1 ext4 37f68ebe-1ea5-4cdd-ac94-a44d321f8d22 720,1M 21% /boot
├─sda2 btrfs Håom 4d3c5932-453b-4eb2-9a71-3c017b230cd7 43,3G 11% /home
├─sda3 btrfs lager1 879e6a15-206b-46c2-881f-197d79808eda 59,4G 72% /lager1
└─sda4 ext4 45c07f2f-eca6-4948-aaed-2471610b22d4 26,2G 3% /var
sdb
└─sdb1 btrfs terralager d77d3850-667c-43d8-a806-779286baa711
sdc
├─sdc1 swap 4cb64699-ed99-4431-9e28-37c50244d887 [SWAP]
└─sdc2 btrfs 746dc818-52db-4720-ba39-c26494ee3007 64,8G 8% /
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sudo cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sdb2 during installation
UUID=746dc818-52db-4720-ba39-c26494ee3007 / btrfs defaults,subvol=@ 0 1
# /boot was on /dev/sda1 during installation
UUID=37f68ebe-1ea5-4cdd-ac94-a44d321f8d22 /boot ext4 defaults 0 2
# /home was on /dev/sda2 during installation
UUID=4d3c5932-453b-4eb2-9a71-3c017b230cd7 /home btrfs defaults,subvol=@home 0 2
# /lager1 was on /dev/sda3 during installation
UUID=879e6a15-206b-46c2-881f-197d79808eda /lager1 btrfs defaults 0 2
# /var was on /dev/sda4 during installation
UUID=45c07f2f-eca6-4948-aaed-2471610b22d4 /var ext4 defaults 0 2
# swap was on /dev/sdb1 during installation
UUID=4cb64699-ed99-4431-9e28-37c50244d887 none swap sw 0 0
#
# Terralager internal hdd extra storage space
UUID=d77d3850-667c-43d8-a806-779286baa711 /terralager btrfs defaults,subvol=@ 0 1
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root@OptiPlex-780:/# ls -l
total 48
lrwxrwxrwx 1 root root 7 Jan 16 23:42 bin -> usr/bin
drwxr-xr-x 4 root root 4096 Jan 17 00:10 boot
drwxr-xr-x 1 root root 0 Jan 16 23:45 cdrom
drwxr-xr-x 20 root root 4560 Jan 17 00:46 dev
drwxr-xr-x 1 root root 4248 Jan 17 00:30 etc
drwxr-xr-x 1 root root 8 Apr 15 2020 home
drwxrwxr-x. 1 sprinterdriver sprinterdriver 138 Aug 19 13:37 lager1
lrwxrwxrwx 1 root root 7 Jan 16 23:42 lib -> usr/lib
lrwxrwxrwx 1 root root 9 Jan 16 23:42 lib32 -> usr/lib32
lrwxrwxrwx 1 root root 9 Jan 16 23:42 lib64 -> usr/lib64
lrwxrwxrwx 1 root root 10 Jan 16 23:42 libx32 -> usr/libx32
drwxr-xr-x 1 root root 0 Jan 4 15:14 media
drwxr-xr-x 1 root root 0 Jan 4 15:14 mnt
drwxr-xr-x 1 root root 0 Jan 4 15:14 opt
dr-xr-xr-x 303 root root 0 Jan 17 00:46 proc
drwx------ 1 root root 122 Jan 17 00:21 root
drwxr-xr-x 34 root root 900 Jan 17 00:46 run
lrwxrwxrwx 1 root root 8 Jan 16 23:42 sbin -> usr/sbin
drwxr-xr-x 1 root root 0 Jan 4 15:14 srv
dr-xr-xr-x 13 root root 0 Jan 17 00:46 sys
drwxr-xr-x 1 root root 0 Jan 17 00:33 terralager
drwxrwxrwt 1 root root 1256 Jan 17 00:57 tmp
drwxr-xr-x 1 root root 116 Jan 4 15:14 usr
drwxr-xr-x 12 root root 4096 Jan 4 15:48 var
[edit]
Sorry, this starting to be a bad habit of me, starting posts in forums and then figure out the solution before anyone get time to involve in discussion. This is no exception.
While reading through my own post just after submitting, I realized that the other storage partition /lager1 , that was already there when install (I added the mount point during Mint installation) did not had the subvol option for btrfs in fstab. So I tried to remove that, and now it work.
The new line in /etc/fstab is just changed to
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UUID=d77d3850-667c-43d8-a806-779286baa711 /terralager btrfs defaults 0 1The only thing I don't like about this is that the solution was just a strike of luck. If I haven't seen the line with /lager1 in /etc/fstab, I wouldn't have figured this out.
So therefore I have a follow up question : How can I list up subvolumes in btrfs volumes (a web search reveals how to create, but cannot find any way to differentiate between subvolume and ordinary folders on the root folder of the volume) ?
Also, how does subvol=@ differs from not having that mount option at all ?